removed space from event handler

examples/fast-chatbot/bot.py

@@ -137,12 +137,14 @@ async def main(settings: BotSettings):
             await task.queue_frame(EndFrame())
 
         # When the first participant joins, the bot should introduce itself.
-        @ transport.event_handler("on_first_participant_joined")
+        @transport.event_handler("on_first_participant_joined")
         async def on_first_participant_joined(transport, participant):
             # Provide some air whilst tracks subscribe
             time.sleep(2)
             messages.append(
-                {"content": "Briefly introduce yourself by saying 'hello, I'm FastBot, how can I help you today?'"})
+                {
+                    "role": "system",
+                    "content": "Briefly introduce yourself by saying 'hello, I'm FastBot, how can I help you today?'"})
             await task.queue_frames([LLMMessagesFrame(messages)])
 
         runner = PipelineRunner()